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<TITLE>[Chapter 6] 6.2 A First Applet</TITLE>
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<td width=171 align=center valign=top><B><FONT FACE="ARIEL,HELVETICA,HELV,SANSERIF" SIZE="-1">Chapter 6<br>Applets</FONT></B></TD>
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<DIV CLASS=sect1>
<h2 CLASS=sect1><A CLASS="TITLE" NAME="JNUT2-CH-6-SECT-2">6.2 A First Applet</A></h2>

<P CLASS=para>
<A HREF="ch06_02.htm#JNUT2-CH-6-FIG-1">Figure 6.1</A>
shows what is probably the simplest possible applet you can
write in Java.<A NAME="CH6.IMAGES-1"></A>
<A HREF="ch06_02.htm#JNUT2-CH-6-EX-1">Example 6.1</A>
lists its code. This example introduces the <tt CLASS=literal>paint()</tt>
method, which is invoked by the applet viewer (or Web
browser) when the applet needs to be drawn. This method
should perform graphical output--such as drawing text or
lines or displaying images--for your applet. The argument
to <tt CLASS=literal>paint()</tt> is a <tt CLASS=literal>Graphics</tt> object that you
use to do the drawing.

<DIV CLASS=figure>
<h4 CLASS=figure><A CLASS="TITLE" NAME="JNUT2-CH-6-FIG-1">Figure 6.1: A simple applet</A></h4>


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<h4 CLASS=example><A CLASS="TITLE" NAME="JNUT2-CH-6-EX-1">Example 6.1: The Simplest Applet</A></h4>

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<P>
<PRE>
import java.applet.*;   // Don't forget this import statement!
import java.awt.*;          // Or this one for the graphics!
public class FirstApplet extends Applet {
  // This method displays the applet.
  // The Graphics class is how you do all drawing in Java.
  public void paint(Graphics g) {
    g.drawString("Hello World", 25, 50);
  }
}
</PRE>
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<P CLASS=para>
To display an applet, you need an HTML file that references
it. Here is an HTML fragment that can be used with our
first applet:

<P CLASS=para>
<DIV CLASS=screen>
<P>
<PRE>
&lt;APPLET code="FirstApplet.class" width=150 height=100&gt;
&lt;/APPLET&gt;
</PRE>
</DIV>

<P CLASS=para>
With an HTML file that references the applet, you can now
view the applet with an applet viewer or Web browser. Note
that the <tt CLASS=literal>width</tt> and <tt CLASS=literal>height</tt> attributes of this
HTML tag are required.  See <A HREF="ch15_01.htm">Chapter 15, <i>Java-Related HTML Tags</i></A> for more details on the HTML
<tt CLASS=literal>&lt;APPLET&gt;</tt> tag.  For most applet examples in this
book, we show only the Java code and not the
corresponding HTML file that goes with it.  Typically, that
HTML file contains a tag as simple as the one shown here.

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